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# Pump hot water in through a spray ball until it’s about 2” deep.
# Hard bung the barrel, and rotate ~75° every 10-15 minutes.
# If the bung has pulled a vacuum by the time it’s on its 5th rotation, the barrel is ready for to rinse , purge with CO<sup>2</sup>, and refillfill with beer or wort.
* See also [https://barrelbuilders.com/wp-content/uploads/2015/02/Barrel-Maintenance-Repair-Manual.pdf Barrel Builders Barrel Maintenance Repair Manual, Section 2.3] (using SO2 for soaking more than 2 days).